When you first sign-up to get the Redbox emails they will send you a code for a free movie rental. Create your Redbox account you can subscribe to Text Messages and get a unique code for a free movie rental the first Monday of each month sent to you via text message. They also may send out codes to their subscribers once in a while, so it's worth subscribing!
You can find a kiosk one the Redbox website. I know we have you at our Walgreens.